No journey to _Reykjahlið_ would be complete without a visit to the small island of _Slútness_, one of the extinct craters in the lake. It is a paradise for ducks. Having obtained permission of the farmer at _Grimstaðir_, Grim’s-Farm, who owns the island, we rowed out to the island accompanied by the farmer and _Ólafur_. Such a place for ducks we had never seen; they breed in thousands on the small islands in the lake and in the retired creeks, but the island of _Slútness_ is one great nest for ducks. The farmer told us that he had already taken over 13,000 eggs from the island that season, and had left sufficient for breeding purposes. These eggs are packed in water-glass for winter consumption. One may walk across the island in three minutes with ease and this makes the number of birds seem all the larger. During the nesting season it is not possible to step anywhere without taking precaution not to tread upon the birds. Here one may see the Golden Eyed Duck, _Clangula Islandica_, in all its glory, lift it from the nest for photographing and return it without any apparent disturbance to the bird. The eider duck, _Somateria Mollissima Dresseri_, is abundant on this island, though usually seeking the sea coast during the nesting season. The island itself, even if the birds were missing, is charming. It is circular in form, with the crater portion filled with water to the level of the lake. It is in this water that the ducklings take their first swimming exercises. In many places it was literally covered with the puffy brown balls that darted hither and yon amid the loud scolding of the numerous mothers in their efforts to keep the different families from getting inextricably mixed. Around the margin of the basin there is a remarkable plant society with numerous members, wonderful for this high latitude, above Lat. 65°-30´. The mountain ash and Arctic willow form dense thickets near the margin of the pool and close to the water the Angelica, _Angelica officinalis_, stands to a height of five feet and when crushed fills the air with the fragrance of its oil. This plant grows luxuriantly on many portions of the lake shore as well as on the islands and it is highly prized by the inhabitants. The list of plants which we collected here is too long to give in full. There were over thirty specimens of flowering plants, among which we noticed the violets in dense mats, vigorous geraniums, _Geranium maculatum_, with larger and deeper colored blossoms than in New England, dandelions and arnica in great profusion, asters, marigolds and wild pinks. This island will yield a good deal of information to the botanist interested in _Ecology_ and in the variation of species.